<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>break语句</title>
</head>
<body>
<script type="text/javascript">
	var sum = 0                      
	for(var i = 0; i < 100; i++){  
		sum=sum+i;
	    if(sum>10)break;         //如果自然数之和大于10则跳出循环
	}
	alert("求0-99的自然数之和："+sum); 
</script>
</body>
</html>
